Light weight slip



Aug. 13, 1935.

w. A. AEGG 2,010,938

LIGHT WEIGHT SLI P Filed May 14, 1954 2 SheetsSheet l f 2 Z: 229 /7 34 l v Z4 /6 Z4 A5 g g i Z5 M 5 M #2 [6 A; I Z I 2/ 3hr F I 5 Q 3/53 23 BY Mzmei fi' a Z2 ATTORNEY Aug. 13, 1935. w. A. ABEGG LIGHT WEIGHT SLIP Filed May 14, 1954 2 Sheets-Sheet 2 l N VENTOR ZQZZTBAAZIGE A TTORNE V Patented Aug. 13, 1935 LIGHT: WEIGHT. SLIP Walter A; Abeg g, Los Angeles, Calif;,'assignor of one-halite Baldwin Reinhold, Lps Angeles,

Application ltlayl4l1934, Sa No. 725,467

y 10 Claims. (01. 24-263) 7 Th s n n ionrelate f o o W dr lina-app rat s and pa i ula l p t i s o. sl p for rotary drilling tables. i

- Inthe dri .011 wells y the may mam ejdr ll em xtend hr u h t tahl t mld engaged by slips which .hold the drill stem in fixed relationto-the table, -I hese slips are arcuate and represent. segments ,of a circle concentric with the longitudinal-axis of the drill stem whereby a set of slips may be arranged around the drill stem and positioned upon a seat in a rotary table, said seat being preferably tapered, the degree of taper ag reeing withthe taper formed onthe outer face of the slips. Whenthedrill stem'is of a relatively small diameter the individual slips are of light we ght and mayhere di y ha d. OWfi ene the diameter of the drill stern increases the size and weight ofthe slipsincrease and the larger SilgSgQf slips of necessity are quite heavy, often ,each weighmg 125 pounds. It will be recogmzed gthatin the courseof a well drillingoperation, and pa t cularly wh nthewe h d a h a derable depth the manipulation of .the slips would b t laboriou -tasks. 1. at t .1

It is. the principal ohject'of the present inven- ,tionjtherefor ,to provide slips of a design which have maxim m wearing qualities and a n'iiniiiunilweightwhereby t eyv mayb r ad y m ved 'frorn. place to place and adjusted, and'may be used-Mini a GDnSiderableperiod oftiinewithout replacement, the structure furt r. 3 emb yin earls for permitting wearing surfaces to, be relfnewedg aildfor preventing the slips froniacCiv aentau 'mnm through the hole mule drilltable.

flfhsnresent invention'pontem nt s the. provision p" for rotajr "wel drilling operations which fjisdes in t 'hzeia rslai eiv sma tm m of "metal suitably reinforced to provide amaxistrength and which alsornakes it possible to 1 f i Theinvention is illustrated by way of example *ih'the accompanying drawings, inwhich';

carry renewable wear plates.

Figure l is a view in elevation showing a rotary table upon which the slips of the present'inven tionareused. f Fig.2 is an enlarged view in central vertical 1 section showing the construction of the slip with which the present invention is concern d, taken on irregular line 2-2 of Figidu Fig. 3 is'a view inend elevation showing the slip. -Fig. 4 is a view in transverse section through the slip as seen on the line 4-4 of Fig.2. 3 "Fig.5 is a view of theslip in transverse section the ribs l9 aretied together by a portion 22 which provides a downwardly and inwardly tapered its-secured position by screwed! extending int *jythwfib '20, The tennmating flanges 21 on each 1 slip arev of a length s ffi iently less than the width -ofthe plate so that the plate may be accommodatedas itslidesinto position. The upper web 24 Pig; 6 is-aview in elevation showing the slip, .bwwhichthevertical ribs aretiedi together is elm-J6 particularly illustrating th manner in which the wear plate is mounted and the reinforcement of hesl pb W c s lig t ei t i bta n d- Referring more particularly to the drawings,

lilindicates a rotary tablecarrying a usual y.

are formed with an inner face l4 emf/ending vertie cal and parallel to the outer face of the stem l2..

T n's inner face is pre rably .f rmed with a Pluralit oi lon it din y r ces ed groov I which re eive inserts I6, this port on f the structure bei g d s gn d n acc dance with the showing o Patent. No.- 1,8 4,316, issued t George E. Mohegan December .1, .1.93. in which the lowe e d'oi each in ert is secur d t th ttom o th p in a manner to have free r ta ion, and th upper end of each insert is secured by an insert a; lock plate ll, the detailsof which will be more fully s ibed h e naf e e bo o t e sl p comprises the'front arcuate face It on a radius the centerof which is the longitudinal axis of the drill stern. This portion ofthe slip is relatively a thin; andreinforced by vertical ribs l9 and lateral ribs "20'.

The vertical ribs taper longitudinally andare arranged along the are of a circle so that' tliey" may properly fit within the tapered seat occurring within the inner rotary table H.

'1?'O1' purposes of strength it is preferable that the group of ribs l9 are disposed in parallel-relation to each' other while terminating ribs 2| at the sides of "each slip extend radially; The lower ends of shoulder 23. An arcuately extending web portion 24 ties the upper ends of the ribs together an'dis formed. with an upwardly and inwardly tapered shoulder 25. The shoulders 23 and 25 ex-* tend arcuately and parallel. The length of verti- I cal ribs 19 occurring betweenthese shoulders is wince-.01. the slip and into p sition between the tapered shoulders 13 and flithereof, after which it V 33 which project outwardly and have openings 34 to receive the pintle pins of a handle 35. It may also be desirable to form the lock plate with projecting lugs 36. These lugs give an overall width to each slip which is greater than the diameter of the hole in the rotary table through which the drill stem extends, and it is thus insured that the slips cannot accidently fall through the opening in the table.

In operation of the present invention the slip is made according to a showing of the drawings and ispreferably cast from lightweight material, such for example as aluminum having extreme strength. After-the inner face of the body member l8" has been machined to its proper arcuate configuration and the longitudinal recesses have been forme'dto provide seats for the inserts i5 therear faceof the ribs is machined to form the inclined faces 23 "and 25 and to form a space for the wear plate 25. The wear plate 25 may then be slipped in position along an arcuate path as previously'described and may be fastened by the screws 2'5. "The inserts may be placed in their position'within the recesses I5 and fastened by the lock plate ll. It will then be evident that the vulnerable points of wear on the front and back. faces 'of the slip will be protected by inserts I 5 and wear plates 26, both of which are made of steel having extreme wearing qualities.

By the use of light weight metals having considerable strength, such for example as certain ,amnunu alloys, and by protecting the wearing surfaces of the slips with hardened steel inserts and wear plates, it is possible to materially reduce [the weight of the slips without sacrificing strength .7 or wearing qualities, and in fact it has been found that an elimination of as much as sixty-five per ycent of the normalweight of a drill slip may be obtained inthis manner. I I It-will thus be seen that the devicehere disclosed-may be built to be extremely light in weight :Willl'lOlli; sacrificing strength, and at the same time will be provided with wear means adapted to be readily applied and renewed, thus furnishing all of'the' desired features of a drill slip without the weight which is now necessary in order to give the slip adequate strength.

Whil'el have shown the preferred form of my invention, as now knownto me, it will be understood that various changes may be made in the "combination, construction, and arrangement of parts by those skilled in the art, without departing from the spirit of the invention as claimed.

Having thus described my invention, what I claim and desire to secure by Letters Patent is: 1. A drill slip comprising an arcuate face plate .adapted to conform to the outer face of a drill I' stem'to be gripped thereby, a plurality of longi- 0 tudinally extending ribs formed integral withsaid faceplate, the outer edges of said ribs being downwardly and inwardlytapered, said tapered -faces being arcuately'arranged with relation to the section of the slip whereby the arcuate face plate will conform to the face of the drill stem and the inclined ribs will conform to a tapered seat of a rotary table, and an arcuate wear plate adapted to be disposed over the tapered faces of the ribs whereby a wear member will be interposed between the ribs and the tapered seat of the rotary drill table.

2. A drill slip comprising an arcuate face plate adapted to conform to the outer face of a drill stem to be gripped thereby, a plurality of longitudinally extending ribs formed integral with. said face plate, the outer edges of said ribs being down wardly and inwardly tapered, said tapered faces being arcuately arranged with relation to the section of the slip whereby the arcuate face plate will conform to the face of the drill stem and the inclined ribs will conform to a tapered seat of a rotary table, an arcuate wear plate adapted to be disposed over the tapered faces of the ribs whereby a wear member will be interposed between the ribs and the tapered seat of the rotary drill table, and wear means mounted on the inner face of the slip and interposed between said face and the face of the drill stem. a

3. A drill slip comprising an arcuate face plate adapted to conform to the outer face of a drill stem to be gripped thereby, a plurality of longitudinally extending ribs formed integral with said face plate, the outer edges of said ribs being downwardly and inwardly tapered, said tapered faces being arcuately arranged with relation to the section of the slip wherebythe arcuate face plate will conform to the face of the drill stem and the inclined ribs will conform to a taperedseat of a rotary table, an arcuate wear plate adapted to be disposed over the tapered faces of the ribs whereby a wear member will be interposed between the ribs and the tapered seat of the rotary drill table, and wear means mounted on the inner face of the slip and interposed between said face and the face of the drill stem, said wear means comprising a plurality of-longitudinally disposed inserts adapted to be mounted for separate rotation around their longitudinal axes.

4. A drill slip comprising a body member having a front face which is curved horizontally and straight vertically, said face conforming to the surface contour of the drill pipe, a back face curved horizontally, and tapered longitudinally to conform to a seat in a rotary 'drill table Within which the slip is seated, and means formedas a part of the slip having an overall dimension greater than the maximum width of the hole in the rotary table whereby the slip will be prevented from falling through the hole.

5. A drill slip having a front face conforming to a segment of the face of a drill stem,'and having a back face tapered to conform to a tapered seat in a rotary table, the back face being constructed with wear means adapted to be interposed between the tapered face of the slip and the tapered face of the seat in the rotary table, said wear means being in the form of an arcuate wear plate adapted to sheath the tapered face of the slip and to be removably secured;- thereto, said securing means including seats" formed on the back surface of the drill slip and with which the wear plate interlocks at its upper and lower edges.

6. A drill slip characterized by its light weight which comprises an arcuate face plate adapted to conform to a segment of the circumference of a drill stem, the opposite edges of said-plate being such as to permit a plurality of plates to be grouped around the drill stem, a plurality of? a drill stem, a plurality of longitudinally extending back ribs formed integral with the said arcuate plate and tapering downwardly and inwardly to conform substantially to the tapered seat of a rotary table, transverse back ribs connecting and reenforcing said longitudinally tapered ribs, under-cut seats formed in the face of upper and lower transverse rib sections, a longitudinally extending wear plate interlocked with said seats, and means for securing the same in position. a

8. A drill slip comprising an arcuate body plate formed with a longitudinal recess in its forward face, an overhanging flange at the lower end of said recess, a wear member adapted to be positioned within said recess and having a lip interlocking with said overhanging flange at its lower end and an upwardly projecting lipat its upper end, a lock plate disposed at the upper end of the arcuate plate and having an overhanging flange engaging the upper lip of the wear member, cooperating means for interlocking the lock member with the arcuate plate, and fastening means therefor.

9. A drill slip comprising an arcuate body plate formed with a longitudinal recess in its forward face, an overhanging flange at the lower end of said recess, a wear member adapted to be positioned within said recess and having 'a lip interlocking with said overhanging flange at its lower end and an upwardly projecting lip at its upper end, a lock plate disposed at the upper end of the arcuate plate andhaving an overhanging flange engaging the upper lip of the wear member, cooperating means for interlocking the lock member with the arcuate plate, fastening means therefor, and a handle carried by a part of said lock plate;

10. A drill slip comprising an arcuate body plate formed with a longitudinal recess in its forward face, an overhanging flange at the lower end of said recess, a wear member adapted to be positioned within said recess and having a lip interlocking with said overhanging flange at its lower end and an upwardly projecting lip at its WALTER A. ABEGG. 

